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-rw-r--r--PROTOCOL.u2f4
1 files changed, 4 insertions, 0 deletions
diff --git a/PROTOCOL.u2f b/PROTOCOL.u2f
index 32bfa20f..066d0995 100644
--- a/PROTOCOL.u2f
+++ b/PROTOCOL.u2f
@@ -170,6 +170,10 @@ is signed over a blob that consists of:
byte[] extensions
byte[32] SHA256(message)
+No extensons are yet defined for SSH use. If any are defined in the future,
+it will be possible to infer their presence from the contents of the "flags"
+value.
+
The signature returned from U2F hardware takes the following format:
byte flags (including "user present")